I have an interview in the army in no less than 4 days and I wanted to ask you for any tips that would help me.

I have an interview in the army in no less than 4 days and I wanted to ask you for any tips that would help me. Jobless for years the cause why is known already, I have a severe stutter, last time i got rejected in army, during interview i was totally calm and confidence, During the interview, I don't know if I was able to say 2 words, It was like I lost my voice. Even though they were so KIND that they only asked me to tell them where I was from, how old I was, and where I went to school, I couldn't even whisper, still I don’t believe that this happened to me but I guess this is life